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ENHANCING SEISMIC ANALYSIS OF BRIDGES THROUGH SOIL-STRUCTURE INTERACTION

Vishwas P G1, Ashwini Satyanarayana2

1Student, Department of Civil Engineering, Dayanand Sagar College of Engineering, Shavige Malleshwara Hills, Kumaraswamy Layout, Bengaluru, Karnataka 560078, India

2Professor, Department of Civil Engineering, Dayanand Sagar College of Engineering, Shavige Malleshwara Hills, Kumaraswamy Layout, Bengaluru, Karnataka 560078, India

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Abstract - Seismically isolated bridge structures are widely employed as a crucial measure for mitigating the destructive effects of earthquakes. The effectiveness of these isolation systems relies not only on the properties of the bridge structure but also on the interaction between the structure and the underlying soil. The understanding of soil-structure interaction (SSI) plays a vital role in designing and assessing the performance of seismically isolated bridges. This project aims to investigate the influence of SSI on seismically isolated bridge structures by considering variations in soil types under different ground motion scenarios.

To achieve this objective, the study will employ numerical modelling techniques and advanced analysis tools. First, a comprehensive literature review will be conducted to identify and summarize the key parameters affecting SSI in seismically isolated bridges. These parameters include soil stiffness, damping characteristics, and nonlinear soil behaviour. Subsequently, a numerical model representing a seismically isolated bridge system will be developed, considering different soil types commonly encountered in bridge engineering, such as sandy soil, clayey soil, and layered soil profiles.

isolated bridge structures, facilitating the development of more accurate design guidelines and improved assessment methodologies.

Key Words:  Soil-structure interaction, Ground motions, Numerical modelling, Dynamic response